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Hi. Welcome to Just Answer. My name is***** I'm sorry to hear about this situation with Rambler. Is he still eating and drinking well? Do you feel that he's drinking excessively or urinating more than normal? How long has he been tamed?
There are a few common causes of weight loss in older cats. I've listed them below with links for more detailed information on those specific diseases.1) Hyperthyroidism http://www.VeterinaryPartner.com/Content.plx?P=A&S=0&C=0&A=5162) Diabetes http://www.VeterinaryPartner.com/Content.plx?P=A&S=0&C=0&A=6313) Chronic renal disease (kidney failure)http://www.VeterinaryPartner.com/Content.plx?P=A&C=&A=2633&SourceID=4) Cancer5) Intestinal parasites6) FELV/ FIV - both viral infections.The first three diseases and the last one, I've listed can best be screened for by having your vet perform blood work and a urinalysis on your kitty. The fourth disease, cancer, can sometimes be suspected on a physical exam if a mass is palpated. Other tests to help screen for cancer include blood work and imaging studies such as radiographs and ultrasound. However, an aspirate or biopsy of suspect tissue is required for a definitive diagnosis. Intestinal parasites can be screened for by having a fecal sample examined by your veterinarian. The first step in getting a proper diagnosis for rambler would be to have your vet do an exam on him and perform at least some blood work. As far as what you can do at home, that is limited to just trying to increase his calorie intake, but most likely that isn't addressing the primary problem.